body {
  font-family: sans-serif;
  text-align: center;
  background: #e0f7fa;
}
#world {
  border: 2px solid #555;
  background: #fff;
  margin: 10px auto;
  display: block;
}
#toolbar {
  margin: 10px;
}
.part {
  margin: 0 5px;
  padding: 5px 10px;
}
#launch {
  margin-top: 10px;
  padding: 8px 16px;
}